Give it my best!

How about "Give my best in all that I do"

Unfortunately, we would need more context to advise you correctly. J. Ríos is right: you usually hear the expression as ‘give it my best’. Here are a few examples of how you might use this and related expressions: • I’m not sure about what I’ll say in the briefing tomorrow, but I plan to give it my best. [not sure of herself] • I’m not sure about what I’ll say in the briefing tomorrow, but I plan to do my best. [not so sure of the outcome] • Every day, I give my best at work. [quality effort] • Every day at work, I do my best. [tries hard] • Every day at work, I give it my best. [tries hard] • Every day at work, I do the best I can. [tries hard but not so sure of himself] • In astronomy, in accounting, in whatever I do, I always give my best. [quality effort] • In astronomy, in accounting, in whatever I do, I always give it my best. [tries hard] give it my best ~ emphasis on trying hard give my best ~ emphasis on the quality of what’s given